FIELD: chemical technology. SUBSTANCE: method of extraction of carboxylic acids from an aqueous solution containing at least one acid of the group of C1-10-carboxylic acids involves contact of an aqueous solution with a solvent consisting of the mixed trialkylphosphine oxides. Process is carried out in the flow of countercurrent liquid-liquid extraction by dehydration of enriched solvent by heat supply for water removal form the solvent, acid desorption from the dehydrated enriched solvent flow to obtain a recirculating solvent. Invention ensures to obtain acids that can be used repeatedly in the technological unit. EFFECT: improved method of extraction, high purity and quality of acids. 34 cl, 2 dwg
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